AMDGPU/GlobalISel: Select G_BITREVERSE

llvm-svn: 370980

Author: arsenm

llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp

@@ -1775,6 +1775,7 @@ AMDGPURegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
   case AMDGPU::G_CTTZ_ZERO_UNDEF:
   case AMDGPU::G_CTPOP:
   case AMDGPU::G_BSWAP:
+  case AMDGPU::G_BITREVERSE:
   case AMDGPU::G_FABS:
   case AMDGPU::G_FNEG: {
     unsigned Size = MRI.getType(MI.getOperand(0).getReg()).getSizeInBits();

llvm/lib/Target/AMDGPU/VOP1Instructions.td

@@ -227,7 +227,7 @@ defm V_COS_F32 : VOP1Inst <"v_cos_f32", VOP_F32_F32, AMDGPUcos>;
 } // End SchedRW = [WriteQuarterRate32]
 
 defm V_NOT_B32 : VOP1Inst <"v_not_b32", VOP_I32_I32>;
-defm V_BFREV_B32 : VOP1Inst <"v_bfrev_b32", VOP_I32_I32>;
+defm V_BFREV_B32 : VOP1Inst <"v_bfrev_b32", VOP_I32_I32, bitreverse>;
 defm V_FFBH_U32 : VOP1Inst <"v_ffbh_u32", VOP_I32_I32>;
 defm V_FFBL_B32 : VOP1Inst <"v_ffbl_b32", VOP_I32_I32>;
 defm V_FFBH_I32 : VOP1Inst <"v_ffbh_i32", VOP_I32_I32>;

llvm/test/CodeGen/AMDGPU/GlobalISel/inst-select-bitreverse.mir

@@ -0,0 +1,53 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -march=amdgcn -mcpu=hawaii -run-pass=instruction-select -verify-machineinstrs -o - %s  | FileCheck %s
+
+---
+name: bitreverse_i32_ss
+legalized: true
+regBankSelected: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0
+    ; CHECK-LABEL: name: bitreverse_i32_ss
+    ; CHECK: [[COPY:%[0-9]+]]:sreg_32 = COPY $sgpr0
+    ; CHECK: [[S_BREV_B32_:%[0-9]+]]:sreg_32 = S_BREV_B32 [[COPY]]
+    ; CHECK: S_ENDPGM 0, implicit [[S_BREV_B32_]]
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:sgpr(s32) = G_BITREVERSE %0
+    S_ENDPGM 0, implicit %1
+...
+
+---
+name: bitreverse_i32_vv
+legalized: true
+regBankSelected: true
+
+body: |
+  bb.0:
+    liveins: $vgpr0
+    ; CHECK-LABEL: name: bitreverse_i32_vv
+    ; CHECK: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    ; CHECK: [[V_BFREV_B32_e64_:%[0-9]+]]:vgpr_32 = V_BFREV_B32_e64 [[COPY]], implicit $exec
+    ; CHECK: S_ENDPGM 0, implicit [[V_BFREV_B32_e64_]]
+    %0:vgpr(s32) = COPY $vgpr0
+    %1:vgpr(s32) = G_BITREVERSE %0
+    S_ENDPGM 0, implicit %1
+...
+
+---
+name: bitreverse_i32_vs
+legalized: true
+regBankSelected: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0
+    ; CHECK-LABEL: name: bitreverse_i32_vs
+    ; CHECK: [[COPY:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    ; CHECK: [[V_BFREV_B32_e64_:%[0-9]+]]:vgpr_32 = V_BFREV_B32_e64 [[COPY]], implicit $exec
+    ; CHECK: S_ENDPGM 0, implicit [[V_BFREV_B32_e64_]]
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:vgpr(s32) = G_BITREVERSE %0
+    S_ENDPGM 0, implicit %1
+...

llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-bitreverse.mir

@@ -0,0 +1,31 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -march=amdgcn -mcpu=fiji -run-pass=regbankselect %s -verify-machineinstrs -o - -regbankselect-fast | FileCheck %s
+# RUN: llc -march=amdgcn -mcpu=fiji -run-pass=regbankselect %s -verify-machineinstrs -o - -regbankselect-greedy | FileCheck %s
+
+---
+name: bitreverse_i32_s
+legalized: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0
+    ; CHECK-LABEL: name: bitreverse_i32_s
+    ; CHECK: [[COPY:%[0-9]+]]:sgpr(s32) = COPY $sgpr0
+    ; CHECK: [[BITREVERSE:%[0-9]+]]:sgpr(s32) = G_BITREVERSE [[COPY]]
+    %0:_(s32) = COPY $sgpr0
+    %1:_(s32) = G_BITREVERSE %0
+...
+
+---
+name: bitreverse_i32_v
+legalized: true
+
+body: |
+  bb.0:
+    liveins: $vgpr0
+    ; CHECK-LABEL: name: bitreverse_i32_v
+    ; CHECK: [[COPY:%[0-9]+]]:vgpr(s32) = COPY $vgpr0
+    ; CHECK: [[BITREVERSE:%[0-9]+]]:vgpr(s32) = G_BITREVERSE [[COPY]]
+    %0:_(s32) = COPY $vgpr0
+    %1:_(s32) = G_BITREVERSE %0
+...